Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4880a17bbc0a3e4…

MALICIOUS

PDF

71.6 KB Created: 2020-11-14 01:49:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 4dd60f98464b3874fd9bb69543a931cc SHA-1: d52febd20365911139b2ae51599a1b8dc69c15c0 SHA-256: f4880a17bbc0a3e4feabc47912f0e6fe92f9bf83d356e159d22b899ada7005cc
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafffe.ru/strik?utm_term=chanson+le+vent+dans+les+voiles PDF link annotation
    • https://dodivimibo.weebly.com/uploads/1/3/4/3/134305777/2ead8e40f79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393220/normal_5f8f768463da2.pdfIn PDF document text
    • https://visuxotilan.weebly.com/uploads/1/3/4/5/134593687/nefowebopo.pdfIn PDF document text
    • https://bonujuvab.weebly.com/uploads/1/3/2/7/132740321/834649.pdfIn PDF document text
    • https://wemugevesusufe.weebly.com/uploads/1/3/4/4/134467109/2995918.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367624/normal_5f957ea5180aa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5cc5931-101f-4631-8982-43d90462f8d5/18052490226.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fdccb29-beb9-412f-946d-5edf772a32a4/beebe_public_speaking_handbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5487667-b591-47fe-8125-a636c19bb8ba/42446787692.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6c9adf2-f3ef-4b44-9351-c7d446ee99b9/xubejupitiraber.pdfIn PDF document text
    • https://s3.amazonaws.com/migivewuwe/basic_algebra_worksheets_year_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b798d25-9547-4c5b-a722-0c5a24e12e4d/doorking_1834_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/39bef68b-44fa-49c3-a26a-52600a67cc2e/54147803666.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA1A 4780 bytes
SHA-256: e859dec3919029cd73816f9dc2c4d1f132952f3c7dae1993caa60b23357ce24b
font_01_sfnt_off0000ea57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA57 11892 bytes
SHA-256: 025cf02b166200b7bae8f57045895958be9bd40ff0c5e281081cd91f6e62a70e

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